416 THE BLOOD, BY ALEXANDER ROLLETT. 



The variations depend upon the age, sex, period after food, and 

 the vascular territory from which the blood examined has been 

 taken. 



Under all these different circumstances the number of the 

 white blood corpuscles has been counted, according to the 

 methods adopted for the enumeration of the red * 



On the average there is, according to Welcker, one white 

 corpuscle to 335 red, and according to Moleschott, one to 357. 



Boys have one colourless to 226 coloured. Men, one to 346. 

 Old men, one to 381. Girls, one to 389. Young women who are 

 menstruating, one to 247. The same women, when not menstru- 

 ating, one to 405. Pregnant women, one to 281 (Moleschott). 



Hirt found in the early morning, and in the fasting condi- 

 tion, that the proportion was one white corpuscle to 716 red; 

 half an hour after breakfast, 1 : 347 ; two to three hours later, 



Fig. 74. 



1 : 1,514 ; ten minutes after a midday dinner, 1 : 1,592 ; half 

 an hour after the same, 1: 429; two to three hours after the 

 same, 1 : 1,481 ; half an hour after tea, 1 : 544 ; two to three 

 hours after tea, 1 : 1,227. 



In the splenic vein, Hirt found the proportion to be 1 : 60 ; 



* Welcker, Prager, Virteljahrschrift, loc. cit. Moleschott, Wiener medi- 

 cin. Wochenschrift, 1854, No. 8. Hirt, De Copia relativa Corpusculorum 

 Sanguinis Alborum. Diss. inaug. Lips., 1855. E. de Purg,Virchow's Archiv, 

 Band viii., p. 301. Marfels, Moleschott's Untersuchungen zur Naturlehre, 

 etc., Band i., p. 61. Lorange, Quomodo ratio Cellularum alb. et rub. mutetur, 

 etc., Diss. inaug. Regiomont, 1856. 



